Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07D—HETEROCYCLIC COMPOUNDS
  • C07D295/00—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms
  • C07D295/02—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms containing only hydrogen and carbon atoms in addition to the ring hetero elements
  • C07D295/027—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms containing only hydrogen and carbon atoms in addition to the ring hetero elements containing only one hetero ring
  • C07D295/03—Heterocyclic compounds containing polymethylene-imine rings with at least five ring members, 3-azabicyclo [3.2.2] nonane, piperazine, morpholine or thiomorpholine rings, having only hydrogen atoms directly attached to the ring carbon atoms containing only hydrogen and carbon atoms in addition to the ring hetero elements containing only one hetero ring with the ring nitrogen atoms directly attached to acyclic carbon atoms
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
  • A61P25/02—Drugs for disorders of the nervous system for peripheral neuropathies
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
  • A61P25/20—Hypnotics; Sedatives
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
  • A61P25/26—Psychostimulants, e.g. nicotine, cocaine
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C205/00—Compounds containing nitro groups bound to a carbon skeleton
  • C07C205/45—Compounds containing nitro groups bound to a carbon skeleton the carbon skeleton being further substituted by at least one doubly—bound oxygen atom, not being part of a —CHO group
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C49/00—Ketones; Ketenes; Dimeric ketenes; Ketonic chelates
  • C07C49/587—Unsaturated compounds containing a keto groups being part of a ring
  • C07C49/657—Unsaturated compounds containing a keto groups being part of a ring containing six-membered aromatic rings
  • C07C49/665—Unsaturated compounds containing a keto groups being part of a ring containing six-membered aromatic rings a keto group being part of a condensed ring system
  • C07C49/675—Unsaturated compounds containing a keto groups being part of a ring containing six-membered aromatic rings a keto group being part of a condensed ring system having three rings
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C49/00—Ketones; Ketenes; Dimeric ketenes; Ketonic chelates
  • C07C49/587—Unsaturated compounds containing a keto groups being part of a ring
  • C07C49/687—Unsaturated compounds containing a keto groups being part of a ring containing halogen
  • C07C49/697—Unsaturated compounds containing a keto groups being part of a ring containing halogen containing six-membered aromatic rings
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C49/00—Ketones; Ketenes; Dimeric ketenes; Ketonic chelates
  • C07C49/587—Unsaturated compounds containing a keto groups being part of a ring
  • C07C49/703—Unsaturated compounds containing a keto groups being part of a ring containing hydroxy groups
  • C07C49/747—Unsaturated compounds containing a keto groups being part of a ring containing hydroxy groups containing six-membered aromatic rings
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C49/00—Ketones; Ketenes; Dimeric ketenes; Ketonic chelates
  • C07C49/587—Unsaturated compounds containing a keto groups being part of a ring
  • C07C49/753—Unsaturated compounds containing a keto groups being part of a ring containing ether groups, groups, groups, or groups
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C57/00—Unsaturated compounds having carboxyl groups bound to acyclic carbon atoms
  • C07C57/46—Unsaturated compounds having carboxyl groups bound to acyclic carbon atoms containing six-membered aromatic rings and other rings, e.g. cyclohexylphenylacetic acid
  • C07C57/50—Unsaturated compounds having carboxyl groups bound to acyclic carbon atoms containing six-membered aromatic rings and other rings, e.g. cyclohexylphenylacetic acid containing condensed ring systems
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C57/00—Unsaturated compounds having carboxyl groups bound to acyclic carbon atoms
  • C07C57/52—Unsaturated compounds having carboxyl groups bound to acyclic carbon atoms containing halogen
  • C07C57/62—Unsaturated compounds having carboxyl groups bound to acyclic carbon atoms containing halogen containing six-membered aromatic rings and other rings

Definitions

• the invention comprises the racemic mixture as well as each of the components separately.
• the lower alkyl groups contain up to 6 carbon atoms, preferably 1-3 carbon atoms.
• the polymethylene group of the substituent A is preferably an ethylene or a trimethylene group, which may be lower alkyl substituted.
• the substituent R 1 is preferably located in the 5-position.
• R 4 and R 5 form a hetercyclic ring, said ring is preferably 5-, 6- or 7-membered.
• suitable hetercyclic groups are the pyrrolidino and piperidino groups as well as a possibly N 4 -lower alkylated piperazino group.
• Examples of especially interesting subgroups of the new compounds of formula I are those, wherein R 2 and R 3 together with the carbon atom, to which they are bonded, form a carbocyclic ring, especially the cyclopentane ring, and further such compounds, wherein R 1 signifies halogen, especially chlorine or fluorine.
• suitable groups X which can be converted into the side chain A - B by conventional methods, the following may be mentioned: Cyanoalkyl, carbamoylalkyl, N-mono- and N,N-disubstituted carbamoylalkyl, nitroalkyl, oximinoalkyl, iminoalkyl or alkoxycarbonylaminoalkyl groups, and the conversion into compounds of formula I is performed by reduction and/or hydrolysis.
• Especially suitable starting materials are unsaturated acids of the formula ##STR5## wherein R 1 , R 2 , R 3 and the broken lines are as defined above and R 4 signifies hydrogen or lower alkyl.
• the indanone is condensed with cyano acetic acid, in which case the corresponding unsaturated cyano acetic acid derivative is formed, which is decarboxylated to the corresponding nitrile, which is either reduced to a primary amine of formula I or hydrolysed into carboxylic acid.
• the carboxylic acids are transformed in a manner known per se into amides which after reduction yield the desired amines of formula I.
• the conversion into the compounds I is obtained in a manner known per se by reduction.
• the reduction agent of choice is in the first place catalytically activated hydrogen gas and the reaction is carried out in the presence of a catalyst such as platinum, a palladium or a nickel catalyst, preferably in a solvent such as water or a lower alcohol such as methanol or ethanol and at a temperature, which is preferably chosen between 20° and 150° C. and at a hydrogen pressure which is preferably chosen between atmospheric pressure and 100 atg.
• Another method is to reduce by means of a complex metal hydride such as a sodium borohydride or lithium aluminium hydride in an inert solvent, which can be for example ether, dioxan or tetrahydrofurane.
• a complex metal hydride such as a sodium borohydride or lithium aluminium hydride in an inert solvent, which can be for example ether, dioxan or tetrahydrofurane.
• an inert solvent which can be for example ether, dioxan or tetrahydrofurane.
• the last-mentioned method is also preferably used in those cases, where X is a carbamoylalkyl group (B-CO-alkyl wherein B is as defined above).
• the conversion into the compounds I can be obtained by hydrolysis with an acid, preferably a mineral acid such as hydrochloric acid or sulfuric acid, or with a base, usually an alkali metal hydroxide such as a sodium or potassium hydroxide solution.
• an acid preferably a mineral acid such as hydrochloric acid or sulfuric acid
• a base usually an alkali metal hydroxide such as a sodium or potassium hydroxide solution.
• the compound I in which the side chain A - B consists of the aminoalkyl group of the alkoxycarbonyl aminoalkyl group.
• the alkoxycarbonyl aminoalkyl group can be converted to the corresponding N-methyl-aminoalkyl group by reduction, preferably by means of complex metal hydrides as described above.
• the group X can be a reactively esterified hydroxyalkyl group or a phosphoniumalkyl group, e.g. a halogenalkyl-, a sulphonyloxyalkyl- or a triarylphosphonium halogenidalkyl group, said intermediates being converted into the corresponding compounds of formula I or acyl derivatives thereof in a manner known per se by reaction with an amine or an alkali metal salt or an acyl-derivative thereof, e.g. a phtalyl derivative. The acyl-derivative can then be converted to the free amine I in a manner known per se.
• a reactively esterified hydroxyalkyl group or a phosphoniumalkyl group e.g. a halogenalkyl-, a sulphonyloxyalkyl- or a triarylphosphonium halogenidalkyl group
• said intermediates being converted into the corresponding
• the sulphonyloxy derivatives are preferably methanesulphonyloxy, benzenesulphonyloxy, toluenesulphonyloxy or naphtalensulphonyloxy compounds.
• the synthesis can possibly be carried out in two steps, and in this case the unsaturated indanyliden compound is initially prepared and said compound is then converted into the corresponding indene derivative, e.g. by treatment with a strong acid.
• the organometallic compounds used by the process (2) are preferably Grignard-compounds such as halogenmagnesium compounds, especially chloromagnesium compounds, but also alkali metal compounds, especially lithium compounds, can be used. Said compounds are reacted in a manner known per se with an indanone of formula III, whereafter the adduct formed is hydrolysed and dehydrated.
• the reaction with the Grignard-reagent is carried out in an inert solvent such as ether, dioxan or tetrahydrofuran, and the hydrolysis is preferably obtained by addition of an acid or an ammonium chloride solution.
• R 1 signifies halogen or alkoxy groups
• said groups can either be present in the starting material or be introduced at a suitable stage of the reaction series by means of conventional methods.
• the formed amines of formula I can, if desired, be converted to salts with physiologically acceptable acids, and the tertiary amines to the corresponding amine oxides.
• Starting materials or end products which are mixtures of optical isomers, may be split into the pure optical antipodes in a manner known per se, for instance by fractional crystallization of diastereoisomeric salts.
• the starting materials used by the process according to the invention are known compounds, whereas others are new.
• the starting materials which are new can be prepared by means of methods known per se. It may, for example, be mentioned that the compounds 1,1-dimethylindan-3-one and spiro(cyclohexane-1,1'-indan)-3'-one, which are known compounds, and spiro(cyclopentane-1,1'-indan)-3'-one, which is a valuable new starting compound, said compounds being used as starting materials in the following examples, can be prepared by heating the acid chlorides of the corresponding substituted ⁇ -phenylpropionic acids with polyphosphonic acid according to the general method disclosed by V. Seidlova and M.
• spiro(cyclopentane-1 1'-indene) which is easily obtained from indene by alkylation with 1,4-dibromobutan, can in a simple manner and with a high yield be converted to the desired indanone of formula V by the addition of a hydrogen halogenide, preferably hydrogen chloride, and subsequent oxidation of the obtained 3'-halogen-spiro(cyclopentane-1,1'-indan), and then introducing, if desired, a halogen, nitro or lower alkyl substituent R in a manner known per se.
• a hydrogen halogenide preferably hydrogen chloride
• the oxidation of the obtained 3'-halogen-(especially chloro)-spiro(cyclopentane-1,1'-indan) is preferably carried out by means of chromic acid or an acid chromate solution.
• the new indanones of formula V can, in addition to the preparation of the above described, new and pharmacodynamically active compounds of formula I, also be used for the preparation of other pharmacodynamically active compounds, e.g.
• R 1' signifies hydrogen, halogen, lower alkoxy groups having 1-3 carbon atoms or nitro groups and A' is a possibly lower alkyl substituted ethylene or trimethylene group and R 4' and R 5' individually signify hydrogen or alkyl groups having 1-4 carbon atoms or toadmier with the amine nitrogen form a heterocyclic ring, which in addition to the amine nitrogen can contain an oxygen atom or a possibly lower alkylated imino group.
• the indanone of formula V can be converted into the valuable end-products of formula VII by reaction with a compound of formula VIII
• A' is as defined above and B' either is ##STR9## or a group convertible thereto, whereafter B', if necessary is converted to ##STR10##
• the reaction is preferably carried out in an inert solvent such as ethanol and pyridine.
• the compound VIII can in this case be used as a freee base or in the form of a salt with an acid. In the latter case the reaction is carried out in the presence of an acid binding agent, e.g. sodium carbonate or pyridine.
• the new compounds of formula VII have pharmacodynamic properties similar to those of the new compounds of formula I.
• the compounds VII can also be prepared in such a manner that the indanone V is firstly converted to the corresponding indanone oxime in conventional manner (e.g. by reaction with hydroxyl amine) and then reacting the oxime formed with a compound of formula
• A' is as defined above and B' either signifies the group ##STR11## or a group, which may be converted into said group, and X signifies a reactively esterified hydroxy group, e.g. halogen or arylsulphonyloxy group.
• the reaction is preferably carried out in an inert solvent such as dimethylformamid or acetonitrile and by using the compound X--A'--B' in the form of a salt, e.g. with alkali metal ions or quarternary ammonium ions.
• the new compounds of formula I according to the invention have in animal tests proved to process valuable pharmacological effects, especially on the central nervous system, which are especially manifested as an ability to counteract the effect of reserpine, an effect which in pharmacology is used as a measure of the suitability of a compound as a drug against depressions. Certain ones of the substances at the same time show other effects on the central nervous system such as a sedative effect. The compounds all together have low toxicity.
• the compounds can be transformed into suitable pharmaceutical forms of preparations, e.g. tablets or solutions, which, for example can contain between 1 and 500 mg of the active substance.
• mice All experiments were carried out on albino mice, 18-25 g. The animals had free access to water except during the test period, but were not allowed to eat 4-5 hours before the experiment.
• the tested substances were administered orally to mice in groups of 6, at 4 dosage levels: (12.7; 40; 127 and 400 mg/kg). A control group of 6 mice receiving water was observed simultaneously.
• mice were injected intraperitoneally with 2.5 mg/kg reserpine, which had been solubilized with a few drops of glacial acetic acid.
• reserpine 2.5 mg/kg reserpine
• the ptosis was measured; 0 in score is given for no closure of the eye, 1 for 1/4, 2 for 1/2, 3 for 3/4 and 4 for completion closure.
• the score varies between 0 and 8 for each mouse (the sum of score for 2 eyes). The maximum value for 6 mice is thus 48.
• the percentage of antagonism for each compound after 0.5; 1; or 2 hours for each dosage group was obtained by comparision with the score of the simultaneously observed control group.
• the table indicates the percentage of antagonism after 60 minutes, which is the optimal time for measuring antireserpine effect in this test system.
• Anhydrous hydrogenchloride gas is bubbled through spiro(cyclopentane-1,1'-indene) (117.5 g; 0.69 moles) until 25 g have absorbed.
• the temperature is held under +10° C. by cooling on an ice bath.
• the liquid obtained is distilled and at first a small amount of unreacted spiro-cyclopentaneindene passes over, followed by about 135 g (Yield 95%) 3'-chlorospiro(cyclopentane-1,1'-indan) bp 97° C./0.7 mm Hg.
• n D 20 1.5625.
• the above reaction can also be carried out continuously without intervening isolation of the chlorine compound.
• a solution of 5'-nitro-spiro(cyclopentane-1,1'-indan)-3'-one (23.1 g; 0.1 mole) in methanol (250 ml) is hydrogenated in a shaking autoclave at about 4 atg with a Raney-nickel catalyst at 40°-60° C.
• the mixture is chilled, the catalyst filtered off and washed with methanol, after which the filtrate is evaporated to dryness.
• a light yellow powder is obtained (19.5 g; yield 97%).
• Said powder is dissolved in 2 N hydrochloric acid and extracted with ether, and then the aqueous phase is neutralized with 2 N sodium hydroxid solution.
• the precipitate is filtered off, washed with water and dried, and 18.8 g of a yellow-white crystal powder is obtained.
• a sample is recrystallized twice from benzene and then melts at 125° C.
• a mixture of 5'-amino-spiro(cyclopentane-1,1'-indan)-3'-one (20.1 g; 0.1 mole), 23% hydrochloric acid (35 ml), water (76 ml) and ice (3 g) is diazotised at about +5° C. with a solution of sodium nitrate (11 g) in water (25 ml).
• the clear solution is added to an ice cooled solution of copper(I)chloride(15 g) in 23% hydrochloric acid (150 ml) and water (60 ml). After agitation for 2.5 hours the mixture is heated to 100° C. for a short while and is then allowed to cool.
• the brown precipitate is sucked off and thoroughly washed with water. Crude yield 20 g (90%).
• the crude product is purified by distillation in vacuum, bp. 135°-136° C./1,5 mm Hg. A sample is crystallized from n-hexane and then melts at 54° C. The oxime melts at 140° C.
• 5'-amino-spiro(cyclopentane-1,1'-indan)-3'-one (78 g; 0.39 mole) is treated for a short with 200 ml of a solution of equal volumes of conc. hydrochloric acid and water.
• the mixture is chilled to 10° C. and diazotised with a solution of sodium nitrate (28.5 g; 0.41 moles) in water (60 ml) at 10° C.
• the reaction mixture is chilled to 0° C., filtrated and dropwise treated under vigorous agitation with a solution of sodium borofluoride (59 g; 0.53 moles) in water (120 ml) at 0° ⁇ 1°.
• Said solution is subjected to water steam distillation, whereby the desired fluoro ketone is obtained from the cooled condensate in form of colourless crystals of mp 79°-80° C.
• the product boils at 100°-105° C./0.1 mm Hg.
• the oxime melts at 156° C.
• a mixture of 5'-amino-spiro(cyclopentane-1,1'-indan)-3'-one (20.1 g; 0.1 mole) 2 N sulphoric acid (150 ml) and ice (30 g) is diazotised at about +5° C. with a solution of sodium nitrate (11 g) in water (25 ml).
• the solution is filtrated and poured in boiling mixture of 100 ml of water and 10 ml of conc. sulphuric acid. The boiling is continued until the development of nitrogen gas ceases, after which the mixture is chilled and the solid, dark brown substance is filtered off. After drying there are obtained 20 g of a crude product, which is recrystallized from trichloroethylene. Yield 12 g of a light powder of mp. 145° C. 4 g of the substance can be recovered from the mother liquid by means of extraction with 2 N sodium hydroxide and subsequent precipitation with 2 N hydrochloric acid.
• a solution of ⁇ -dimethylaminopropyl chloride (24.3 g; 0.2 moles) in anhydrous tetrahydrofuran (50 ml) is added in portions to an about 60° C. hot agitated solution of magnesium flakes (4.8 g; 0.2 gram atoms) and anhydrous tetrahydrofurane (20 ml), containing 1 ml of ethylbromide and 1 crystal of iodine as reaction coupling agent. After the reaction has terminated the agitation is continued for another 15 minutes at 60° C., after which 30 ml of benzene are added and the mixture is cooled to 10°-15° C.
• the combined benzene solutions are extracted with diluted sulphoric acid (100 ml of conc. sulphoric acid to 350 ml of water).
• the acid aqueous phase is heated to 100° C. until volatile components have been eliminated and it is refluxed for a short while. After cooling to about 10° C. the solution is made strongly alkaline with a 40% solution of sodium hydroxide.
• the amine is extracted off with trichloroethylene.
• the extract is dried with anhydrous potassium carbonate, after which the solvent is distilled off.
• the perchlorate is obtained if an ether solution of the amine is treated with perchloric acid. After crystallization from 2-propanol the salt melts at 122° C.
• a mixture of ethylbromoacetate (17.5 g; 0.105 moles) and spiro(cyclopentane-1,1'-indan)-3'-one (18.6 g; 0.1 moles) in anhydrous benzene (25 ml) is added dropwise under agitation to zinc-powder (8.0 g; 0.124 gram atoms) at 60° C.
• the addition is adjusted so as to maintain refluxing.
• the agitation is continued for half an hour under heating to boiling.
• the mixture is allowed to cool and filtrated, after which the filtrate is treated with 10% sulphuric acid.
• the benzene solution is separated, washed with 5% sulphuric acid, saturated sodium carbonate solution and water.
• the solvent is distilled off.
• the oil obtained is hydrolysed with a solution of 20 g of sodium hydroxide in 50 ml of water and 50 ml of ethanol under agitation for 10 hours.
• the alcohol is distilled off and the distillation residue is dissolved in water, washed with ether and acidified with conc. hydrochloric acid.
• An oil is obtained which soon crystallizes.
• the hydroxy acid obtained is dehydrated by boiling with acetic acid for 10 minutes.
• spiro(cyclopentane-1,1'-indan)-3'-ylideneacetic acid crystallizes (17 g of a colourless product, yield 74%); mp. 206° C.
• 1,1-dimethylindan-3-ylidene-acetic acid A crystalline substance. Recrystallized from 2-propanol. Mp. 214° C.
• Dimethyl sulphate (2.5 ml) is under shaking added to 3'- ⁇ -dimethylaminoethylidene-spiro(cyclopentane-1,1'-indan) (1.6 g; 0.007 moles) in methanol (20 ml). After about 5 minutes 450 ml of ether are added and then crystals of trimethylammonium compound are formed (2.2 g; 90%). After crystallization from 2-propanolisopropylether the salt melts at 178° C.
• Fumaric acid monoamine salt mp. 92°-96° C.
• the Grignard reagent is prepared from ⁇ -methoxypropyl bromide (30.6 g; 0.2 moles) and magnesium flakes (4.8 g; 0.2 gram-atoms) in tetrahydrofuran and reacted with spiro(cyclopentane-1,1'-indane)-3'-one (18.6 g, 0.1 moles) in a manner analogous to example 1.
• the reaction product is shaken out with benzene, the combined benzene solutions are dried with anhydrous magnesium sulphate and the solvent is distilled off in vacuum.
• 3'- ⁇ -methoxypropyl-spiro(cyclopentane-1,1'-indan)-3'-ol is obtained as a yellowish oil (yield 27.1 g).
• the crude methoxy compound is refluxed for 62 hours with 48% hydrobromic acid (50 ml) and acetic acid (100 ml).
• the solution is concentrated in vacuum, ether is added to the oil obtained, and then the solution is washed with water and 2 N sodium hydroxide solution. After drying with magnesium sulphate the solvent is distilled off and a brown oil is obtained, which essentially consists of 3'- ⁇ -bromopropyl-spiro(cyclopentane-1,1'-indene).
• the perchlorate is obtained if the ether solution of the amine, 3'- ⁇ -dimethyl-aminoethyl-oximino-spiro(cyclopentane-1,1'-indan), is treated with perchloric acid. After recrystallization from 2-propanol the salt melts at 136°-139° C.
• 3'- ⁇ -methylaminoethylidene-spiro(cyclopentane-1,1'indan)-hydrochloride (26.4 g; 0.10 moles) is refluxed with 500 ml of 0.1 N hydrochloric acid for 1 hour and then cooled to about 4° C., after which the crystallized salt is filtered off, washed with ice water and dried. Mp. 250°-252° C. Yield 17.3 g (65%) of the hydrochloride of 3'- ⁇ -methylaminoethyl-spiro(cyclopentane-1,1'-indene).
• hydrochloride of 3'- ⁇ -dimethylaminoethyl-spiro(cyclopentane-1,1'-indene) is obtained from 3'- ⁇ -dimethylaminoethylidene-spiro(cyclopentane-1,1'-indan)hydrochloride.
• the perchlorate is obtained if said hydrochloride is converted to the free base and precipitated with perchloric acid. After crystallization from 2-propanol/methanol the salt having a mp. of about 100° C. is obtained.
• the solvent is eliminated from the mother liquor from (a) and then an oil is obtained, which consists of about 70% of spiro(cyclopentane-1,1'-indene)-3'-ylacetonitrile and of 30% spiro(cyclopentane-1,1'-indan)-3'-ylideneacetonitrile as well as unreacted ketone.
• 3'- ⁇ -aminoethylidene-spiro(cyclopentane-1,1'-indan)-hydrochloride (4.0 g; 0.016 moles) is boiled for 4 hours with a mixture of water (100 ml) and conc. hydrochloric acid (15 ml). Upon cooling of the solution 3.8 g (95%) of the hydrochloride of 3'- ⁇ -aminoethyl-spiro(cyclopentane-1,1'-indene) crystallizes. Mp. 256°-257° C. after recrystallization from 2-propanol.

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• 1972
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